/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2010-2012 Semihalf * Copyright (c) 2012 The FreeBSD Foundation * Copyright (c) 2013 Ian Lepore * All rights reserved. * * Portions of this software were developed by Oleksandr Rybalko * under sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /* * EHCI driver for Freescale i.MX SoCs which incorporate the USBOH3 controller. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "usbdevs.h" #include #include #include #include "opt_platform.h" /* * Notes on the hardware and related FDT data seen in the wild. * * There are two sets of registers in the USBOH3 implementation; documentation * refers to them as "core" and "non-core" registers. A set of core register * exists for each OTG or EHCI device. There is a single set of non-core * registers per USBOH3, and they control aspects of operation not directly * related to the USB specs, such as whether interrupts from each of the core * devices are able to generate a SoC wakeup event. * * In the FreeBSD universe we might be inclined to describe the core and * non-core registers by using a pair of resource address/size values (two * entries in the reg property for each core). However, we have to work with * existing FDT data (which mostly comes from the linux universe), and the way * they've chosen to represent this is with an entry for a "usbmisc" device * whose reg property describes the non-core registers. The way we handle FDT * data, this means that the resources (memory-mapped register range) for the * non-core registers belongs to a device other than the echi devices. * * Because the main ehci device cannot access registers in a range that's * defined in the fdt data as belonging to another device, we implement a teeny * little "usbmisc" driver which exists only to provide access to the usbmisc * control register for each of the 4 usb controller instances. That little * driver is implemented here in this file, before the main driver. * * In addition to the single usbmisc device, the existing FDT data defines a * separate device for each of the OTG or EHCI cores within the USBOH3. Each of * those devices has a set of core registers described by the reg property. * * The core registers for each of the four cores in the USBOH3 are divided into * two parts: a set of imx-specific registers at an offset of 0 from the * beginning of the register range, and the standard USB (EHCI or OTG) registers * at an offset of 0x100 from the beginning of the register range. The FreeBSD * way of dealing with this might be to map out two ranges in the reg property, * but that's not what the alternate universe has done. To work with existing * FDT data, we acquire the resource that maps all the core registers, then use * bus_space_subregion() to create another resource that maps just the standard * USB registers, which we provide to the standard USB code in the ehci_softc. * * The following compat strings have been seen for the OTG and EHCI cores. The * FDT compat table in this driver contains all these strings, but as of this * writing, not all of these SoCs have been tested with the driver. The fact * that imx27 is common to all of them gives some hope that the driver will work * on all these SoCs. * - "fsl,imx23-usb", "fsl,imx27-usb"; * - "fsl,imx25-usb", "fsl,imx27-usb"; * - "fsl,imx28-usb", "fsl,imx27-usb"; * - "fsl,imx51-usb", "fsl,imx27-usb"; * - "fsl,imx53-usb", "fsl,imx27-usb"; * - "fsl,imx6q-usb", "fsl,imx27-usb"; * * The FDT data for some SoCs contains the following properties, which we don't * currently do anything with: * - fsl,usbmisc = <&usbmisc 0>; * - fsl,usbphy = <&usbphy0>; * * Some imx SoCs have FDT data related to USB PHY, some don't. We have separate * usbphy drivers where needed; this data is mentioned here just to keep all the * imx-FDT-usb-related info in one place. Here are the usbphy compat strings * known to exist: * - "nop-usbphy" * - "usb-nop-xceiv"; * - "fsl,imx23-usbphy" * - "fsl,imx28-usbphy", "fsl,imx23-usbphy"; * - "fsl,imx6q-usbphy", "fsl,imx23-usbphy"; * */ /*----------------------------------------------------------------------------- * imx_usbmisc driver *---------------------------------------------------------------------------*/ #define USBNC_OVER_CUR_POL (1u << 8) #define USBNC_OVER_CUR_DIS (1u << 7) struct imx_usbmisc_softc { device_t dev; struct resource *mmio; }; static struct ofw_compat_data usbmisc_compat_data[] = { {"fsl,imx6q-usbmisc", true}, {"fsl,imx51-usbmisc", true}, {"fsl,imx25-usbmisc", true}, {NULL, false}, }; static void imx_usbmisc_set_ctrl(device_t dev, u_int index, uint32_t bits) { struct imx_usbmisc_softc *sc; uint32_t reg; sc = device_get_softc(dev); reg = bus_read_4(sc->mmio, index * sizeof(uint32_t)); bus_write_4(sc->mmio, index * sizeof(uint32_t), reg | bits); } #ifdef notyet static void imx_usbmisc_clr_ctrl(device_t dev, u_int index, uint32_t bits) { struct imx_usbmisc_softc *sc; uint32_t reg; sc = device_get_softc(dev); reg = bus_read_4(sc->mmio, index * sizeof(uint32_t)); bus_write_4(sc->mmio, index * sizeof(uint32_t), reg & ~bits); } #endif static int imx_usbmisc_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (ofw_bus_search_compatible(dev, usbmisc_compat_data)->ocd_data) { device_set_desc(dev, "i.MX USB Misc Control"); return (BUS_PROBE_DEFAULT); } return (ENXIO); } static int imx_usbmisc_detach(device_t dev) { struct imx_usbmisc_softc *sc; sc = device_get_softc(dev); if (sc->mmio != NULL) bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mmio); return (0); } static int imx_usbmisc_attach(device_t dev) { struct imx_usbmisc_softc *sc; int rid; sc = device_get_softc(dev); /* Allocate bus_space resources. */ rid = 0; sc->mmio = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); if (sc->mmio == NULL) { device_printf(dev, "Cannot allocate memory resources\n"); return (ENXIO); } OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev); return (0); } static device_method_t imx_usbmisc_methods[] = { /* Device interface */ DEVMETHOD(device_probe, imx_usbmisc_probe), DEVMETHOD(device_attach, imx_usbmisc_attach), DEVMETHOD(device_detach, imx_usbmisc_detach), DEVMETHOD_END }; static driver_t imx_usbmisc_driver = { "imx_usbmisc", imx_usbmisc_methods, sizeof(struct imx_usbmisc_softc) }; /* * This driver needs to start before the ehci driver, but later than the usual * "special" drivers like clocks and cpu. Ehci starts at DEFAULT so * DEFAULT-1000 seems good. */ EARLY_DRIVER_MODULE(imx_usbmisc, simplebus, imx_usbmisc_driver, 0, 0, BUS_PASS_DEFAULT - 1000); /*----------------------------------------------------------------------------- * imx_ehci driver... *---------------------------------------------------------------------------*/ /* * Each EHCI device in the SoC has some SoC-specific per-device registers at an * offset of 0, then the standard EHCI registers begin at an offset of 0x100. */ #define IMX_EHCI_REG_OFF 0x100 #define IMX_EHCI_REG_SIZE 0x100 struct imx_ehci_softc { ehci_softc_t ehci_softc; device_t dev; struct resource *ehci_mem_res; /* EHCI core regs. */ struct resource *ehci_irq_res; /* EHCI core IRQ. */ }; static struct ofw_compat_data compat_data[] = { {"fsl,imx6q-usb", 1}, {"fsl,imx53-usb", 1}, {"fsl,imx51-usb", 1}, {"fsl,imx28-usb", 1}, {"fsl,imx27-usb", 1}, {"fsl,imx25-usb", 1}, {"fsl,imx23-usb", 1}, {NULL, 0}, }; static void imx_ehci_post_reset(struct ehci_softc *ehci_softc) { uint32_t usbmode; /* Force HOST mode */ usbmode = EOREAD4(ehci_softc, EHCI_USBMODE_NOLPM); usbmode &= ~EHCI_UM_CM; usbmode |= EHCI_UM_CM_HOST; EOWRITE4(ehci_softc, EHCI_USBMODE_NOLPM, usbmode); } static int imx_ehci_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) { device_set_desc(dev, "Freescale i.MX integrated USB controller"); return (BUS_PROBE_DEFAULT); } return (ENXIO); } static int imx_ehci_detach(device_t dev) { struct imx_ehci_softc *sc; ehci_softc_t *esc; int err; sc = device_get_softc(dev); esc = &sc->ehci_softc; /* First detach all children; we can't detach if that fails. */ if ((err = device_delete_children(dev)) != 0) return (err); if (esc->sc_flags & EHCI_SCFLG_DONEINIT) ehci_detach(esc); if (esc->sc_intr_hdl != NULL) bus_teardown_intr(dev, esc->sc_irq_res, esc->sc_intr_hdl); if (sc->ehci_irq_res != NULL) bus_release_resource(dev, SYS_RES_IRQ, 0, sc->ehci_irq_res); if (sc->ehci_mem_res != NULL) bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->ehci_mem_res); usb_bus_mem_free_all(&esc->sc_bus, &ehci_iterate_hw_softc); return (0); } static void imx_ehci_disable_oc(struct imx_ehci_softc *sc) { device_t usbmdev; pcell_t usbmprops[2]; phandle_t node; ssize_t size; int index; /* Get the reference to the usbmisc driver from the fdt data */ node = ofw_bus_get_node(sc->dev); size = OF_getencprop(node, "fsl,usbmisc", usbmprops, sizeof(usbmprops)); if (size < sizeof(usbmprops)) { device_printf(sc->dev, "failed to retrieve fsl,usbmisc " "property, cannot disable overcurrent protection"); return; } /* Retrieve the device_t via the xref handle. */ usbmdev = OF_device_from_xref(usbmprops[0]); if (usbmdev == NULL) { device_printf(sc->dev, "usbmisc device not found, " "cannot disable overcurrent protection"); return; } /* Call the device routine to set the overcurrent disable bit. */ index = usbmprops[1]; imx_usbmisc_set_ctrl(usbmdev, index, USBNC_OVER_CUR_DIS); } static int imx_ehci_attach(device_t dev) { struct imx_ehci_softc *sc; ehci_softc_t *esc; int err, rid; sc = device_get_softc(dev); sc->dev = dev; esc = &sc->ehci_softc; err = 0; /* Allocate bus_space resources. */ rid = 0; sc->ehci_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); if (sc->ehci_mem_res == NULL) { device_printf(dev, "Cannot allocate memory resources\n"); err = ENXIO; goto out; } rid = 0; sc->ehci_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE); if (sc->ehci_irq_res == NULL) { device_printf(dev, "Cannot allocate IRQ resources\n"); err = ENXIO; goto out; } esc->sc_io_tag = rman_get_bustag(sc->ehci_mem_res); esc->sc_bus.parent = dev; esc->sc_bus.devices = esc->sc_devices; esc->sc_bus.devices_max = EHCI_MAX_DEVICES; esc->sc_bus.dma_bits = 32; /* allocate all DMA memory */ if (usb_bus_mem_alloc_all(&esc->sc_bus, USB_GET_DMA_TAG(dev), &ehci_iterate_hw_softc) != 0) { device_printf(dev, "usb_bus_mem_alloc_all() failed\n"); err = ENOMEM; goto out; } /* * Set handle to USB related registers subregion used by * generic EHCI driver. */ err = bus_space_subregion(esc->sc_io_tag, rman_get_bushandle(sc->ehci_mem_res), IMX_EHCI_REG_OFF, IMX_EHCI_REG_SIZE, &esc->sc_io_hdl); if (err != 0) { device_printf(dev, "bus_space_subregion() failed\n"); err = ENXIO; goto out; } /* Setup interrupt handler. */ err = bus_setup_intr(dev, sc->ehci_irq_res, INTR_TYPE_BIO | INTR_MPSAFE, NULL, (driver_intr_t *)ehci_interrupt, esc, &esc->sc_intr_hdl); if (err != 0) { device_printf(dev, "Could not setup IRQ\n"); goto out; } /* Turn on clocks. */ imx_ccm_usb_enable(dev); /* Disable overcurrent detection, if configured to do so. */ if (OF_hasprop(ofw_bus_get_node(sc->dev), "disable-over-current")) imx_ehci_disable_oc(sc); /* Add USB bus device. */ esc->sc_bus.bdev = device_add_child(dev, "usbus", -1); if (esc->sc_bus.bdev == NULL) { device_printf(dev, "Could not add USB device\n"); goto out; } device_set_ivars(esc->sc_bus.bdev, &esc->sc_bus); esc->sc_id_vendor = USB_VENDOR_FREESCALE; strlcpy(esc->sc_vendor, "Freescale", sizeof(esc->sc_vendor)); /* * Set flags that affect ehci_init() behavior, and hook our post-reset * code into the standard controller code. */ esc->sc_flags |= EHCI_SCFLG_NORESTERM | EHCI_SCFLG_TT; esc->sc_vendor_post_reset = imx_ehci_post_reset; esc->sc_vendor_get_port_speed = ehci_get_port_speed_portsc; err = ehci_init(esc); if (err != 0) { device_printf(dev, "USB init failed, usb_err_t=%d\n", err); goto out; } esc->sc_flags |= EHCI_SCFLG_DONEINIT; /* Probe the bus. */ err = device_probe_and_attach(esc->sc_bus.bdev); if (err != 0) { device_printf(dev, "device_probe_and_attach() failed\n"); goto out; } err = 0; out: if (err != 0) imx_ehci_detach(dev); return (err); } static device_method_t ehci_methods[] = { /* Device interface */ DEVMETHOD(device_probe, imx_ehci_probe), DEVMETHOD(device_attach, imx_ehci_attach), DEVMETHOD(device_detach, imx_ehci_detach), DEVMETHOD(device_suspend, bus_generic_suspend), DEVMETHOD(device_resume, bus_generic_resume), DEVMETHOD(device_shutdown, bus_generic_shutdown), /* Bus interface */ DEVMETHOD(bus_print_child, bus_generic_print_child), DEVMETHOD_END }; static driver_t ehci_driver = { "ehci", ehci_methods, sizeof(struct imx_ehci_softc) }; DRIVER_MODULE(imx_ehci, simplebus, ehci_driver, 0, 0); MODULE_DEPEND(imx_ehci, usb, 1, 1, 1);